A new lawsuit filed by the city of San Francisco on behalf of the state of California alleges that over the past five years, the state of Nevada has dumped 1,500 mental patients onto other states by putting them them on Greyhound busses and sending them over state lines with no prior arrangements with families or other mental hospitals once they arrive.

According to the federal class action lawsuit that the city of San Francisco is spearheading, nearly all of the patients bussed to California need continuous medical care—none of which Nevada state arranged, and all of which cost the city of San Francisco at least $500,000.

"While some of the patients were given the names of shelters or told to dial '911' upon arrival in California, a substantial number were not provided any instructions or assistance in finding shelter, continued medical care, or basic necessities in the cities and counties to which they were sent," the formal complaint states.

Rawson-Neal Hospital and its administrators and staff, which include doctors, nurses and social workers, were aware their patients were indigent, living in shelters or on the streets of Las Vegas or other Nevada cities, and suffered from mental illness requiring ongoing medical care and medication, the plaintiff says.